[Intel-gfx] [PATCH V2] drm/i915/gt: Hold RPM wakelock during PXP suspend

Tejas Upadhyay
2021-11-08T11:02:29Z

selftest --r live shows failure in suspend tests when
RPM wakelock is not acquired during suspend.

This changes addresses below error :
<4> [154.177535] RPM wakelock ref not held during HW access
<4> [154.177575] WARNING: CPU: 4 PID: 5772 at
drivers/gpu/drm/i915/intel_runtime_pm.h:113
fwtable_write32+0x240/0x320 [i915]
<4> [154.177974] Modules linked in: i915(+) vgem drm_shmem_helper
fuse snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio mei_hdcp mei_pxp x86_pkg_temp_thermal coretemp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_intel_dspcfg
snd_hda_codec snd_hwdep igc snd_hda_core ttm mei_me ptp
snd_pcm prime_numbers mei i2c_i801 pps_core i2c_smbus intel_lpss_pci
btusb btrtl btbcm btintel bluetooth ecdh_generic ecc [last unloaded: i915]
<4> [154.178143] CPU: 4 PID: 5772 Comm: i915_selftest Tainted: G
U 5.15.0-rc6-CI-Patchwork_21432+ #1
<4> [154.178154] Hardware name: ASUS System Product Name/TUF GAMING
Z590-PLUS WIFI, BIOS 0811 04/06/2021
<4> [154.178160] RIP: 0010:fwtable_write32+0x240/0x320 [i915]
<4> [154.178604] Code: 15 7b e1 0f 0b e9 34 fe ff ff 80 3d a9 89 31
00 00 0f 85 31 fe ff ff 48 c7 c7 88 9e 4f a0 c6 05 95 89 31 00 01 e8
c0 15 7b e1 <0f> 0b e9 17 fe ff ff 8b 05 0f 83 58 e2 85 c0 0f 85 8d
00 00 00 48
<4> [154.178614] RSP: 0018:ffffc900016279f0 EFLAGS: 00010286
<4> [154.178626] RAX: 0000000000000000 RBX: ffff888204fe0ee0
RCX: 0000000000000001
<4> [154.178634] RDX: 0000000080000001 RSI: ffffffff823142b5
RDI: 00000000ffffffff
<4> [154.178641] RBP: 00000000000320f0 R08: 0000000000000000
R09: c0000000ffffcd5a
<4> [154.178647] R10: 00000000000f8c90 R11: ffffc90001627808
R12: 0000000000000000
<4> [154.178654] R13: 0000000040000000 R14: ffffffffa04d12e0
R15: 0000000000000000
<4> [154.178660] FS: 00007f7390aa4c00(0000) GS:ffff88844f000000(0000)
knlGS:0000000000000000
<4> [154.178669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [154.178675] CR2: 000055bc40595028 CR3: 0000000204474005
CR4: 0000000000770ee0
<4> [154.178682] PKRU: 55555554
<4> [154.178687] Call Trace:
<4> [154.178706] intel_pxp_fini_hw+0x23/0x30 [i915]
<4> [154.179284] intel_pxp_suspend+0x1f/0x30 [i915]
<4> [154.179807] live_gt_resume+0x5b/0x90 [i915]

Changes since V1 :
- split the HW access parts in gt_suspend_late - Daniele
- Remove default PXP configs

Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 7 ++++---
drivers/gpu/drm/i915/pxp/intel_pxp_pm.c | 15 ++++++++++++---
drivers/gpu/drm/i915/pxp/intel_pxp_pm.h | 18 ++++++++++++++++--
3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index b4a8594bc46c..d4029de1c80d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -303,7 +303,7 @@ void intel_gt_suspend_prepare(struct intel_gt *gt)
user_forcewake(gt, true);
wait_for_suspend(gt);

- intel_pxp_suspend(&gt->pxp, false);
+ intel_pxp_suspend_prepare(&gt->pxp, false);
}

static suspend_state_t pm_suspend_target(void)
@@ -328,6 +328,7 @@ void intel_gt_suspend_late(struct intel_gt *gt)
GEM_BUG_ON(gt->awake);

intel_uc_suspend(&gt->uc);
+ intel_pxp_suspend(&gt->pxp);

/*
* On disabling the device, we want to turn off HW access to memory
@@ -355,7 +356,7 @@ void intel_gt_suspend_late(struct intel_gt *gt)

void intel_gt_runtime_suspend(struct intel_gt *gt)
{
- intel_pxp_suspend(&gt->pxp, true);
+ intel_pxp_runtime_suspend(&gt->pxp);
intel_uc_runtime_suspend(&gt->uc);

GT_TRACE(gt, "\n");
@@ -373,7 +374,7 @@ int intel_gt_runtime_resume(struct intel_gt *gt)
if (ret)
return ret;

- intel_pxp_resume(&gt->pxp);
+ intel_pxp_runtime_resume(&gt->pxp);

return 0;
}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
index 23fd86de5a24..3f91996dc6be 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
@@ -7,8 +7,9 @@
#include "intel_pxp_irq.h"
#include "intel_pxp_pm.h"
#include "intel_pxp_session.h"
+#include "i915_drv.h"

-void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
+void intel_pxp_suspend_prepare(struct intel_pxp *pxp, bool runtime)
{
if (!intel_pxp_is_enabled(pxp))
return;
@@ -23,10 +24,18 @@ void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
*/
if (!runtime)
intel_pxp_invalidate(pxp);
+}

- intel_pxp_fini_hw(pxp);
+void intel_pxp_suspend(struct intel_pxp *pxp)
+{
+ intel_wakeref_t wakeref;

- pxp->hw_state_invalidated = false;
+ if (!intel_pxp_is_enabled(pxp))
+ return;
+ with_intel_runtime_pm(&pxp_to_gt(pxp)->i915->runtime_pm, wakeref) {
+ intel_pxp_fini_hw(pxp);
+ pxp->hw_state_invalidated = false;
+ }
}

void intel_pxp_resume(struct intel_pxp *pxp)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
index c89e97a0c3d0..f2cf3117ed93 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
@@ -9,10 +9,15 @@
#include "intel_pxp_types.h"

#ifdef CONFIG_DRM_I915_PXP
-void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime);
+void intel_pxp_suspend_prepare(struct intel_pxp *pxp, bool runtime);
+void intel_pxp_suspend(struct intel_pxp *pxp);
void intel_pxp_resume(struct intel_pxp *pxp);
#else
-static inline void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
+static inline void intel_pxp_suspend_prepare(struct intel_pxp *pxp, bool runtime)
+{
+}
+
+static inline void intel_pxp_suspend(struct intel_pxp *pxp)
{
}

@@ -20,5 +25,14 @@ static inline void intel_pxp_resume(struct intel_pxp *pxp)
{
}
#endif
+static inline void intel_pxp_runtime_suspend(struct intel_pxp *pxp)
+{
+ intel_pxp_suspend_prepare(pxp, true);
+ intel_pxp_suspend(pxp);
+}

+static inline void intel_pxp_runtime_resume(struct intel_pxp *pxp)
+{
+ intel_pxp_resume(pxp);
+}
#endif /* __INTEL_PXP_PM_H__ */
--
2.31.1